Rotary pump.



w. 'E. SHORE.

ROTAR Y PUMP. APPLICATION FILED DEC. 9, I932.

Patented Sept. 1-1, 1915.

3 MEETS-SHIFT Witnesses.

MK. 6%. I

W. E. SHORE.

ROTARY PUMP. v APPLICATION FILED nc.9'. 1912.

Patented Sept. 14, 1915.

3 SHEEIS--SHEE'I 3.

inventor.

W-(IQM. E

"ra n ll" die GEE, OF TOBGNTG, GNTARIO, CANADA, ASSIGNOR, BY DIRECT AND N- ES, TO THE FBA'NEY- snonn coMrsnY, or WILMINGTON, DELA- RBTARY PUMP.

Specification of Letters Patent.

Patented Sept. 1d, 1915.

Application filed December 9, 1912. 7 Serial No. 735,616.

19 aZZ whom my concern:

it known that 1, WILLIAM EDWARD S ionn a subjectof the King of Great Britaiin and resident oft-he city of Toronto county or Yr ii, Province'of Ontario, in the Dcn'zinion oi Can da, have invented certain new and useful iiiiprovenients in Rotary PLUHPS. described in the following specification and, illustrated in the accompanying drawings.

Tie 13 consists in the novel constructionand arrangement of vanes, pivotally supported core 'eccentrically arranged cylinder, are held in constant relation to the inner wall nod whereby said piston 2., to overlap and expel the loans or"- fluid through the disinvention are, to mini leakage and friction in a ing pivotal piston vanes, g :1 perfect and uniform contact to cylinder wall and the outer s and to provide the maxi area of surfaces between nay be operated at very high may be utilized e1ther as a vacuum machine or a power c drawings, Figure 1 is a side elevaoi": my machine with one of the :aps 'cunn'ed. Fig, 2 is a vertical mids-scrional view of the ma- 3 is YQI't-lCHl sectional view uuinallv oi the Fig. lis one of the piston ion; a portion of the ro- Fig, 5 is a perspec- J of the pivotal piston vanes. numerals of reference indicate corparts in each lflEUIG.

to the drawings, 1 is a cylin- 1 ported on a base 2 and pro .iznllar recesses 3 at the ends l end flanges 4;. cments of the central portion 1 extending thcrcaround for ion of its circumference fornicipal feature cf this invention parts whereby the outer ends et, and further to devise channels 5 and 7 corrr ,fit snug y n o t e 1,1 municating with the intake and exhaust openings 8 and 9 respectively. The channel v6 opens into the cylinder at one side thereof and the opening extends to a point close to the vertical bottom center. The outlet opening 10 through the cylinder wall extends a short distance from the .vertical top center.

11 is a longitudinal partition wall separating the channel 6 from the channel 7 at the bottom of the casing.

12 is an oil duct in the form of a pipe forming a communicating passage between the channels 6 and 7 extending below the division wall 11, said pipe having a very small opening therethrough.

13 are heads closing" inder and secured to the annular flanges 4. The heads 13 are each formed with annular channels 14 arranged to register with the annular recesses 3 in the casing 1.

15 are inwardly projecting annular flanges formed on the inner walls of the heads 13 and arranged eccentrically thereto.

16 is a cylindrical core having its ends recessed to receive the inwardly projecting flanges 15 of the heads.

17' are hardened steel rings fitted within the flanges l5.

18 is a shaft fixedly secured centrally within the core 16 and extending outwardly through the heads 13. I

19 arehardened steel rings encircling the shaft 18 and 20 are roller bearings arranged between the rings 17 and 19 and forming the supporting bearings for the core 16.

21 are part cylindrical shaped recesses formed inthc periphery of the core 16 and extending longitudinally thereof and spaced at equal distances apart.

22 are recesses arranged adjacent to the recesses 21 and also extending longitudinally of the core, the latter recesses being slightly sl1all0\\"or'than the former.

23 are metal strips bedded in the core in radial relation to the recesses 21 and extending thcrointo and having secured at the outer ends the cylindrical shaped bars 24, the peripheries of which. are concentric with the recesses 21 forming circular shaped channels in the core.

25 are the piston vanes formed with the part cylindrical shaped ends 26 adapted to the ends of the cylrecesses 21 and'tc pivot on the cylindrical bars 24. The ends 26 are slotted longitudinally at the inner side and ment without engaging the supporting bars 24. The vanes 25 are formed arc-shaped of a radius corresponding to the radius of the inner wall of the cylinder so that they will at a certain period in the operation of the machine lit snugly against the cylinder wall. The outer ends 28 are formed of cylindrical shape.

29 are the piston contact shoes having their outerfaces 30 formed arc-shaped and of the same radius as the cylinder and having a longitudinal channel 31 opening from one side thereof.

The shoes 29 are bored longitudinally forming a cylindrical socket 32 adapted to receive the cylindrical shaped ends 28 of the piston vanes. The cylindrical ends of the piston vanes are slipped into the shoes longitudinally and as the walls of the cylindrical socket 32 extend for a distance greater than one-half the diameter the shoe is pivotally connected and securely held to the piston vane. I

33 are segmental shaped members preferably formed integral with the shoes 29 and arranged at the ends thereof extending into the annular recesses 3 in the cylinder casing and the annular channels let in the heads.

84L are ring members fitting snugly against the outer periphery of the segmental members 33 and rotatively arranged engaging the outer walls of the annular recesses 3 and channels 14. The rings 3-1 rotate freely in the annular channels and are fixedly secured to the shoe of one of the piston vanes so that they will rotate in unison with the piston. The segmental shaped portions 33 of the shoe members 29 are of such a length as to allow the shoes to slide freely for the limit of their movement to and from each other as the machine rotates according to the varying differences in distances of centers the long bearing portions presenting the maximum bearing surface to the rings.

The rings 34 which encircle the several shoes at each end limit the outward movement of said shoes and as the outer edges of the segmental portions 33 of the shoes and rings extend beyond the ends 35 of the shoes into the annular channels 14, the shoes being positively held from outward and inward movement in relation to the center of the cylinder, so that the surfaces contacting with the cylinder surface, remain in a constant rotative relation thereto.

The rings 34: hold the shoes against the centrifugal action consequently there will be a uniform contact with the cylinder surface at all times without any friction due to centrifugal force.

The piston vanes and shoes, are so constucted and arranged that as the shoes are drawn inward toward the core the forwardly extending O. G. shaped portion of the shoe overlaps and fits snugly against or close to the O. G. shaped portion of thehead of the adjacent piston vane, thus minimizing the space between the shoes and insuring the maximum pressure or expulsion of fluid through the outlet.

The inner surface of the cylinder between the inlet and outlet openings is provided with a plurality of longitudinally arranged grooves 36 which extend from end to end thereof forming recesses. The lubricating oil is carried around the cylinder by the centrifugal action of the rotor and fillin the grooves 36 forms an excellent oil pac ing for the shoes in their travel in contact with the wall of the cylinder.

In the operation of this machine, the shaft and core 16 are rotated by suitable means and as the core rotates the piston vanes 25 and the attached shoes and retaining rings also rotate in unison therewith. The shaft and core are journaled eccentric to the cylinder but as the shoes are held within the annular grooves concentric with the cylinder they are maintained in constant and positive relationship to the inner cylinder wall. The shoes present a very broad contacting surface consequently leakage past the shoes is to all practical purposes entirely eliminated. As the rotor rotates in the direction indicated by arrow, the piston vanes are swung outwardly on their pivotal supports in the rotor and both the pivotal connections of the vanes to the rotor and the shoes to the vanes are of such a nature that the lubricating oil forms a perfect packing preventing leakage therethrough. The sev- 'eral chambers thus formed between the rotating piston vanes form positive compression chambers and as the intake port extends to a point almost at the vertical bottom center, the piston vanes will have swung outwardly to practically their maximum distance before the intake port is cut oil.

The rotary movement of the piston vanes and shoes draws the fluid inwardly and when the intake port is cut off the fluid contained between the pairof shoes then located between the intake and outlet will be com: pressed as the vane is gradually drawn inwardly after the shoe passes over the vertical center of the machine. The compression continues within the crescent shaped chamber between the cylinder wall andg'otor until the shoe of the advance pis't'o1ivane' uncovers the outlet port 10 in the cylinder wall. The compressed fluid then escapes into the outlet chamber. The piston vane continues to close in against the piston core reaching its innermost position fitting snugly against the core with the rounded back of 1,1 some the shoe resting in the longitudinal recess 22 before the outer and forward edgeof the shoe cuts ell the outlet port.

The piston venesand shoes are so arranged and constructed that when the vane swings imvardly to its innermost position against the core the O. G. shaped forward side of the shoe fits snugly against the O. G. shaped back of the advance vane, consequently there will. be no Waste space in which the compressed fluid will be contained but the maximum quantity will be expelled through the outlet port.

The outer peripheral surface or" the arcshaped piston vanes corresponds in radius with the inner wall of the cylinder and as the core rotates the outer surface of the vane moves into contact with the inner wall of the cylinder, making perfect surface contact therewith and maintaining a F uid tight division between the intake and outlet side of the machine until the following shoe closes oll' the outlet port at the back of the piston vane. lhis combined operation ocours with each shoe and all. are arranged to overlap each other so that it will be readily seen that a perfect packing and separation will alwa be l'naintained without any loss due to'friction caused by centrifugal action. The shoes are rotatably held in a positive circular path within the encircling rings 34 and as the rotor rotates it will be seen that each of the shoes will move successively closer to the succeeding shoe and then move further away owing to the differences be tween the center of rotation of the core and the enter of rotation of the shoes. Consequently the shoes will. differentiate in speed, and they can have a very slight movement within the rotating rings as said are connected to one of the shoes of each set.

The device when used as an air pump or 'vacuun'i machine or blower will have a considerable quantity of oil as av bath in the bottom chau'ibers, consequently the rings and shoes and all parts will be perfectly lubricated as well as packed by the oil to prevent loss either through friction or leakage.

If the (luYll'fO is used as a power unit, being rotated by steam directed into the cylinder, the oil will be circulated in a similar manner. The pressure within the exhaust chamber forces the oil. tl'irough the communicating oil duct which has a very small opening thercthrou gh only sulliciently large to allow enough oil to pass without creating a loss in pressure.

niacl'iine such as described is very compact and inclosed in small compass and may be adapted for various uses.

\Vliat I claim as my invention isz- 1. in a rotary pump, the combination with a cylinder, a rotary piston core eccentrically journaled in. said cylinder and piston vanes pivotally connected to said core, of shoe members pivotally secured to the outer ends of said piston vanes, and rotatable means connected to one of said shoe members and engaging the remaining shoes and holding them in fixed inder.

v 2. In a rotary pump, the combination with a cylinder, a rotary piston core eccentrically journaled in said cylinder and piston vanes pivotally connected to said cog-e, of shoe members pivotally secured to the outer ends of said piston vanes, and ring members rotatably supported concentric with the cylinder and operatively engaging said shoes and holding them in fixed relation to the axis of the cylinder.

3. In a rotary pump, the combination with a. cylinder, a rotary piston. core eccentrically journaled in said cylinder and piston vanes pivotally connected to said core, of shoemembers pivotally secured to the outer ends of said piston vanes, and heads closing the ends of said cylinder having annular grooves therein concentric with said cylinder and adapted to receivethe laterally extending ends of said shoes to hold said shoes in operating contact with the surface of the cylinder. 1

at. In a rotary pump, the combination with a cylinder, a. rotary piston core eccentrically journaled in said cylinder and piston vanes pivotally connected to said core, of shoe members pivotally secured to the outer ends of said piston vanes and having segmental members arranged at the ends thereof, and heads closing the ends of said cylinder and having annular grooves into which the said seon'iental members extend.

o. In a rotary pump, the combination with a cylinder, a rotary piston core eccentrically journaled in said cylinder and piston vanes pivotally connected to said core, of shoe members pivot-ally secured to the outer ends of said piston vanes and having segmental members arranged at the ends thereof, annular rings encircling said segmental members and forming a running contact therefor and forming a means for restraining the outward movement of the shoes and piston vanes due to centrifugal force, said rinn's being rotatively supported in the cylinder casing concentric with the inner cylinder Wall. 7

6. In a rotary pump, a cylindrical casing having annular recesses at the ends and intake and exhaust passages opening through the cylinder wall, heads closing the ends of said cylinder, a rotary piston core eccentri c'ally journaled in said casing, a plurality 0i piston vanes pivotally connected to said core and adapted to swing outwardly within the cylinder, shoe members pivotally connected to the outer ends of said piston vanes and having the outer faces are shaped to fit the cylinder wall, segmental members relation to the axis of the cyl-- extending from the ends of said shoes into said annular recesses in the cylinder casing.

ring members rotatively arranged in said annular recesses and operatively engaging the outer peripheries of said segmental members and restrainingltheirioutward movement, and cylinder heads oltisi'n g the ends of said cylinder and having concentric annular recesses or channels therein into which said rings and shoe segments project.

7. In a rotary pump, a cylinder having an inlet port arranged in one side thereof and a discharge port in the other side, a piston core rotatively supported eccentrically within said cylinder, are shaped piston vanes pivotally connected to said core and adapted to engage the cylinder wall between the inlet and discharge port in their rotation. shoe members pivotally connected to the outer ends of said vanes and having arc-shaped faces adapted to engage the inner wall of the cylinder, the forward ends of said shoes being adapted to overlap the inner ends of said vanes connected to the core as the shoe approaches the point of cut-off of the discharge port, and means for holding said shoes in fixed rotative relation to the axis of the cylinder.

8. In a rotary pump, a cylinder having an inlet port arranged in one side thereof and a discharge port in the other side, a piston core rotatively supportedv eccentrically within said cylinder and having longitudinal recesses of arc-shaped cross section formed in the periphery, arc-shaped piston vanes having their outer surfaces of a 'adlus corresponding wlth the radius of the cylinder formed with hollow cylindrical shaped inner ends journaled in said recesses, said in ner ends being slotted longitudinally, cylindrical shaped bars each supported on a thin fiat web arranged in the longitudinal recesses in'said core and rigid therewith and extending through the slot in the hollow cylindrical end of said vanes and forming retaining journal members, shoe members pivotally connected to the outer ends of said vanes and engaging the cylinder wall and rotating in constant contact therewith.

9. In a rotary pump, a cylinder having an inlet port arranged in one side thereof and a discharge port in the other side, a pis-- ton core rotatively supported eccentrically within said cylinder, piston vanes pivotally connected to said core in a sealed joint, and having cylindrical shaped outer ends, shoe members adapted to engage the cylinder wall in running contact and having a cylindrical socket extending longitudinally and opening at one side adapted to receive in pivotal engagement the cylindrical outer end of said vanes to form a sealed pivotal joint, and means for holding said shoes in constant rotative engagement with the cyl inder wall.

10. In arotary pump. a cylinder easing having an enlarged hollow centralportion extending therearound for the major portion of its circumference forming an arc-shaped channel, adivision wall at the bottom of said casing dividing said channel into inlet and exhaust, an inlet port in the cylinder wall opening to the inlet channel and tending to a point close to said division wall. a discharge port in the cylinder wall arranged adjacent to the top and communicating with the discharge channel, a piston core retatively journaled eccentric-ally in said cylinder and spaced close to the upper side the cylinder, piston vanes pivotally' secured. to saidcore and adapted to close the space bctween the intake and discharge contact shoes pivotally' connected to the outer ends of said vanes and adapted to remain in constant ro tative engagement with the cylinder wall, and an oil ductleading around the division wall in said casing and communicating with -both intake and discharge channels.

November 1912.

WILLIAM F. SHORE. Witnesses D. S. ToUnLn, E. HERON.

Toronto, county of York, Ontario, Canada, this 25th day of 

